Urbanization of Aedes mosquito populations and evolution of arboviral disease risk in Africa

Agha, Sheila B.; Tchouassi, David P.

doi:10.1016/j.cois.2022.100988

Cited by 4 publications

(7 citation statements)

References 54 publications

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“…Also, higher abundance of Ae. aegypti in the Kenyan city of Kisumu than Mombasa, could not explain the lack of outbreaks in the former, yet recurrent in the latter (14). In our study, high vector survival rate was associated with reduced trap catches, a proxy for mosquito abundance.…”

Section: Discussioncontrasting

confidence: 57%

“…Thus, the difference in Ae. aegypti blood feeding between Rabai and KV could relate to the degree of urbanization i.e., human population density, which is an important risk parameter of dengue risk (2,14). The observation of a more anthropophilic population in Rabai compared to KV may also point to fundamental differences in the behavior of Ae.…”

Section: Discussionmentioning

confidence: 99%

“…Convergence in the basic components of the disease cycle: the virus, vector, and susceptible human hosts; in a permissive environment, provides the necessary ingredients that facilitate local arboviral pathogen emergence (11,12). Yet, amidst the geographic spread, dengue risk patterns at local scales can be substantially heterogeneous (1,13,14). A better understanding of the complex interactions among these factors is required to predict the risk of dengue spread (15), but knowledge on vector populations and adaptation under changing habitat conditions are critical to achieving this.…”

Section: Introductionmentioning

confidence: 99%

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Patterns of Aedes aegypti abundance, survival, human-blood feeding and relationship with dengue risk, Kenya

Kamau

Sang²,

Rotich³

et al. 2023

Front. Trop. Dis

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Dengue virus (DENV) transmission risk is influenced by the bionomic traits of the key vector, Aedes aegypti. We investigated patterns of abundance, survival, and human blood-feeding of Ae. aegypti populations in two environments in Kenya: peri-urban Rabai (coastal Region, dengue-endemic) and rural Kerio Valley (Rift Valley Region, no reported dengue outbreak). In both environments, Ae. aegypti survival (estimated by parity), was inversely correlated with vector abundance, and this was influenced by weather conditions, notably temperature and relative humidity. In Rabai, Ae. aegypti mostly fed on humans (human blood index=51%), a pattern that corroborates with dengue cases in the coastal region. Aedes aegypti additionally, exhibited opportunistic feeding (livestock, rodents, reptiles, birds), suggesting the risk of human exposure to zoonotic pathogens via spillover transmission events aided by the vector. Abundance and human blood-feeding rates were consistently lower in Kerio Valley likely related to the degree of urbanization. Remarkably, the periods of high human feeding in Rabai coincided with high vector survival rates, a trend that could potentially drive intense DENV transmission at certain times of the year. We found a genetic influence of Ae. aegypti on the degree of anthropophagy but this could be influenced by potential seasonal shifts in human feeding. The findings of this study have implications both for DENV transmission risk and vector control strategies, but also in modeling which should integrate vector bionomic factors beyond vector abundance.

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Section: Discussioncontrasting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Patterns of Aedes aegypti abundance, survival, human-blood feeding and relationship with dengue risk, Kenya

Kamau

Sang²,

Rotich³

et al. 2023

Front. Trop. Dis

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“…Dengue is an urban and semiurban disease (2,141). Aedes aegypti thrives in both environments and is considered the primary vector of the dengue virus.…”

Section: Aedes Aegypti and Aedes Albopictus Vectorial Attributes And ...mentioning

confidence: 99%

Chemical Ecology and Management of Dengue Vectors

Torto,

Tchouassi

2024

Annu. Rev. Entomol.

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Dengue, caused by the dengue virus, is the most widespread arboviral infectious disease of public health significance globally. This review explores the communicative function of olfactory cues that mediate host-seeking, egg-laying, plant-feeding, and mating behaviors in Aedes aegypti and Aedes albopictus, two mosquito vectors that drive dengue virus transmission. Aedes aegypti has adapted to live in close association with humans, preferentially feeding on them and laying eggs in human-fabricated water containers and natural habitats. In contrast, Ae. albopictus is considered opportunistic in its feeding habits and tends to inhabit more vegetative areas. Additionally, the ability of both mosquito species to locate suitable host plants for sugars and find mates for reproduction contributes to their survival. Advances in chemical ecology, functional genomics, and behavioral analyses have improved our understanding of the underlying neural mechanisms and reveal novel and specific olfactory semiochemicals that these species use to locate and discriminate among resources in their environment. Physiological status; learning; and host- and habitat-associated factors, including microbial infection and abundance, shape olfactory responses of these vectors. Some of these semiochemicals can be integrated into the toolbox for dengue surveillance and control. Expected final online publication date for the Annual Review of Entomology, Volume 69 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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“…Dengue virus strains circulate through Ae. aegypti and humans ( Figure 1 ) [ 21 ]. It is highlighted that the dengue virus is transmitted by female mosquitoes, mainly of the Ae.…”

Section: Disease Overviewmentioning

confidence: 99%

Dengue as a Disease Threatening Global Health: A Narrative Review Focusing on Latin America and Brazil

et al. 2023

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Arboviruses constitute the largest known group of viruses. These viruses are the etiological agents of pathologies known as arboviruses, with dengue being one of the most prevalent. Dengue has resulted in important socioeconomic burdens placed on different countries around the world, including those in Latin America, especially Brazil. Thus, this work intends to carry out a narrative-based review of the literature, conducted using a study of the secondary data developed through a survey of scientific literature databases, and to present the situation of dengue, particularly its distribution in these localities. Our findings from the literature demonstrate the difficulties that managers face in controlling the spread of and planning a response against dengue, pointing to the high cost of the disease for public coffers, rendering the resources that are already limited even scarcer. This can be associated with the different factors that affect the spread of the disease, including ecological, environmental, and social factors. Thus, in order to combat the disease, it is expected that targeted and properly coordinated public policies need to be adopted not only in specific localities, but also globally.

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Urbanization of Aedes mosquito populations and evolution of arboviral disease risk in Africa

Cited by 4 publications

References 54 publications

Patterns of Aedes aegypti abundance, survival, human-blood feeding and relationship with dengue risk, Kenya

Patterns of Aedes aegypti abundance, survival, human-blood feeding and relationship with dengue risk, Kenya

Chemical Ecology and Management of Dengue Vectors

Dengue as a Disease Threatening Global Health: A Narrative Review Focusing on Latin America and Brazil

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